Refactor GatewayNode Checks

[whizzzkid]

Discussion: #310 (comment)

Since all of the checks implement the same interface, we can simplify the checks to be run the same way.

AC:

• The check can be standalone, i.e. contain all meta information like the check name and check type.
• We can then dynamically run all checks using the same interface.

e.g.:

//...,
this.origin.check().then(() => log.debug(this.gateway, 'Origin success')).then(this.onSuccessfulCheck.bind(this)),
...

can be refactored as:

const allChecks = [..., OriginCheck, TrustlessCheck, ...];

await Promise.all(async allChecks.map(check => {
    try {
        await check.check();
        log.debug(this.gateway, `${check.name} success`);
        this.onSuccessfulCheck();
    } catch (err) {
        log.error(err);
        throw err;
    }
}));

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[SgtPooki]

awesome, yessir. that’s the direction I was hoping to head toward with the update to typescript. Keep in mind that we will eventually want to update this repo to something more UI friendly (react) while also supporting nodejs based checks. i.e. Business logic (actual checks) are runnable via nodeJS/CLI & in browsers, and UI components can easily wrap and represent those checks visually.